html body {
  height: 100%;
  width: 100%;
}

 .my-header .mui-icon{
   color: #fff;
}
.my-content{
  position: absolute;
  top: 44px;
  bottom: 50px;
  width: 100%;
 
}
.cate-list-left{
  width: 80px;
  float: left;
  position: relative;
  height: 100%;
  background-color: #f5f5f5;
  overflow: hidden;
  padding: 0px;
  margin: 0px;
  list-style: none;
}

.cate-list-left a{
      display: block;
      height: 45px;
      width: 80px;
      line-height: 48px;
      text-align: center;
      border-right: 1px  solid #000;
      border-bottom: 1px  solid #000;
}
.cate-list-left a:active{
      border-right: none;
      background-color: #f5f5f5;
}

.cate-list-right{
  position: relative;
 
  overflow: hidden;
  margin-left: 90px;
  margin-top: 10px;
  height: 100%;
}

 .cate-list-right a {
    display: block;
    float: left;
    width: 33.33%;
 }
 .cate-list-right a img{
  width: 100%;
  vertical-align: top;
}
